SB20261109169 - Improper Certificate Validation in uv

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Main Vulnerability Database SB20261109169

SB20261109169 - Improper Certificate Validation in uv

Published: November 9, 2026

Security Bulletin ID SB20261109169
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Certificate Validation (CVE-ID: CVE-2026-119327)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated network attacker to impersonate HTTPS websites contacted by uv and compromise connection confidentiality and integrity.

The vulnerability exists due to uv's default bundled CA certificates trusting the emSign ECC Root CA - G3 root, whose intermediate CA keys are compromised. An unauthenticated network attacker can use a compromised intermediate key to issue trusted website certificates and intercept or alter HTTPS traffic when positioned between uv and a server.


Remediation

Install update from vendor's website.

References